Drill



O. C. SNELL DRILL Filed April 50, 1956 2 Sheets-Sheet l Nov. 30, 1937.

'55 grally therewith Patented Nov. 34), 1937 to L. E. Kcnn on, Houaton, Tex.

Applicatiqn April 30, 1936, Srlal No. w.zzs 3 ohm. (Cl. zss 14s) This invention relates to a drill.

An object 01' the invention is to provide, in a.

drilling tool, a novel. type ci packing tor torming a close fltting joint to protect the threads of 5 the pin and box where y the drill is connected to the dr1l collar or oi;her iriving memben As is well known in the drilling ofgdeep 'wells a. mud laden driliing:fiuid is forced under high pressure down through the drill stem and out through channeis in the drill to the drill cutters to carry away the cuttings. 'I'he drilling tool is connected to the drill collar of the drill stem.

by means 01 an outwardly threaded pin screwd into an inwardiy threaded box end in many cases a. leakage occurs through the threads, permitting the escape of the drilling fluid and this fluid being under high pressureand containing abrasive material, soon cuts away the threads, destroying the pin or box or both end thus destroying the usefulness of the tool. It is ah object of the invention to provide a. sleeve like p'acking ci. a special when the pin is screwed home in the box, against the escape of the drilling fluid through the threads connecting these parts.

With the above and other objects in view, the invention has particular relation to certain novel features of consttuction,

and use, an example of which is gfir'ir in this speciflcation end illustrated in the accompanying drawings, where Figure 1 shows an edge view of a drill partly in section showing the drill coliar and packing in seotion.

Figure 2 shows an enlarged sec tional view of the packing.

Figure 3 shows an edge view, partly in section,

. of another form of the drill, showing a modified 40 form of packing sleeve therein.

Figure 4 shows an enlarged sectional yiew of the packing sleeve shown in Figure 3.

Figure 5 shows an edge view p.rtly in section o! another modification of the drill, showing another type of packing therein, and

Figure 6 shows an enlarged sectional view of the type of packing shown in Figure 5. Referring now more particularly to the draw.- ings wherein 1ike numerals of reference designate the same parts in each of the figures, the numeral drill, said dri1l having the body 2 terminating ai:

its lower end in cutters 3, 3.

Extending above the dril1 head and formed intethere is a reduced upwardly arrangement o! parts 2 packlngfila has on external annular rib n Which flts snuly wlthin the annular lnslde groove ma at the lower end of the box.

In this torm also the inside of the packlng sleeve "in is slightly concaved for the purposes hereina.bove stated in connectlon with the description of the packlng IO.

In the form shown in Figure 5 the pin |b upstanding from the head. Ib of the drill 1s extended beyond the threads thereot and is blank and the drill collar has the internally threa.ded box 5b which is threaded. to receve the external threads of the pln and. s b1ank above sa.id threads to recelve the blank portion of the p1n which is fltted closely thereln. The upper end of the box in this form 1s undercut formlng the groove |2b and. the upper end. of the pinis upwardly and inwardly tape1ed and spaced from the groove I2b. There is thus formed between the upper end of the box and the upper end of the pin a dovetailed. groove I! and an annular dovetailed. packng sleeve I8 is fitted closely in the groove I! and is subjecfied to endwse pressure by the p1n 41: when screweg into the box to form a. fluid tight joint to prevent the drllling fluid under pressure from reachng the threads.

The drawngs and. description disclose wha.t

are now consdered to be preferred forms of the invention by way of illustration on1y, while the broad principle of the inven1bon will be deflned. by the appended cla.ims.

What I claim is:

1. In combination a. drill and a. driving member, one havng an externally threaded pn and. the other having an nterna.lly th1eaded box to home posltion in the box.

receive the pin. the usembhr havinz a. channel for the possase ot drilllng flu1d therethroush to the drlll cutters. a, sleeve llke poklng in the box through whlch the channel extends, the box baving a.n annular wa.ll zroove to recelve one end of the 'packing and the pin abutting the other end of the packlng, sald pin having a.n end soi:ket and the abutting end of the pacldng belng reduced end fltted into said socket.

2. In combination a. drlll, a. drlvirig member for the drill, saiddrlll and member being provlded, one with a.n externally threaded pln having an end socket and the other with a.n internally threaded box to receive the pin, a. packing member fltted closely in the box one end of whch abuts the corresponding end of the box and whose other end 1s reduced and fitted into the pnsocket and formed wlth on external anmflar shoulder which abuts the free end of the pin.

3. A drilling apparatus having a. fluid passageway therethrough and comprislng adjacent parts, one ha.ving 9. pin provided wlth external threads and a. tapering blan}; portion beyond the threads and the other part haflng a, box provided with internal threads to receive the threads of the pin and a. blank portion into which the bla.nlg portlon of the pin fits closely when the parts a.re sorewed together, the end of the pin and the opposng portion of the box being formed to provide an annular lnsde dovetailed groove and an annular dovetailed packing sleeve fitted. losely into the groove and subject to endwlse compression by the pn when the pn s screwed to OWENS C. SNEIL. 

